Fix warnings

Author: markspanbroek

ethers/providers/jsonrpc/json.nim

@@ -397,7 +397,7 @@ func `%`*[T: object or ref object](obj: T): JsonNode =
 
   T.expectEmptyPragma(serialize, "Cannot specify 'key' or 'ignore' on object defition")
 
-  const serializeAllFields = T.hasCustomPragma(serialize)
+  const serializeAllFields {.used.} = T.hasCustomPragma(serialize)
 
   for name, value in o.fieldPairs:
     # TODO: move to %

testmodule/providers/jsonrpc/testConversions.nim

@@ -135,7 +135,7 @@ suite "JSON Conversions":
 
     without tx =? PastTransaction.fromJson(json):
       fail
-    check tx.blockHash == BlockHash(array[32, byte].fromHex("0x595bffbe897e025ea2df3213c4cc52c3f3d69bc04b49011d558f1b0e70038922"))
+    check tx.blockHash == array[32, byte].fromHex("0x595bffbe897e025ea2df3213c4cc52c3f3d69bc04b49011d558f1b0e70038922")
     check tx.blockNumber == 0x22e.u256
     check tx.`from` == Address.init("0xe00b677c29ff8d8fe6068530e2bc36158c54dd34").get
     check tx.gas == 0x4d4bb.u256
@@ -154,7 +154,7 @@ suite "JSON Conversions":
 
   test "PastTransaction serializes correctly":
     let tx = PastTransaction(
-      blockHash: BlockHash(array[32, byte].fromHex("0x595bffbe897e025ea2df3213c4cc52c3f3d69bc04b49011d558f1b0e70038922")),
+      blockHash: array[32, byte].fromHex("0x595bffbe897e025ea2df3213c4cc52c3f3d69bc04b49011d558f1b0e70038922"),
       blockNumber: 0x22e.u256,
       `from`: Address.init("0xe00b677c29ff8d8fe6068530e2bc36158c54dd34").get,
       gas: 0x4d4bb.u256,